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5911e08c0f
Introduce facilities for guest migration on top of vhost-user infrastructure. Add migration facilities based on top of the current vhost-user infrastructure, moving vu_migrate() and related functions to migrate.c. Versioned migration stages define function pointers to be called on source or target, or data sections that need to be transferred. The migration header consists of a magic number, a version number for the encoding, and a "compat_version" which represents the oldest version which is compatible with the current one. We don't use it yet, but that allows for the future possibility of backwards compatible protocol extensions. Co-authored-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
62 lines
1.7 KiB
C
62 lines
1.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later
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* Copyright Red Hat
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* Author: Laurent Vivier <lvivier@redhat.com>
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*
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* vhost-user common UDP and TCP functions
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*/
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#ifndef VU_COMMON_H
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#define VU_COMMON_H
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#include <linux/virtio_net.h>
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static inline void *vu_eth(void *base)
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{
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return ((char *)base + sizeof(struct virtio_net_hdr_mrg_rxbuf));
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}
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static inline void *vu_ip(void *base)
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{
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return (struct ethhdr *)vu_eth(base) + 1;
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}
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static inline void *vu_payloadv4(void *base)
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{
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return (struct iphdr *)vu_ip(base) + 1;
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}
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static inline void *vu_payloadv6(void *base)
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{
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return (struct ipv6hdr *)vu_ip(base) + 1;
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}
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/**
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* vu_set_element() - Initialize a vu_virtq_element
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* @elem: Element to initialize
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* @out_sg: One out iovec entry to set in elem
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* @in_sg: One in iovec entry to set in elem
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*/
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static inline void vu_set_element(struct vu_virtq_element *elem,
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struct iovec *out_sg, struct iovec *in_sg)
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{
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elem->out_num = !!out_sg;
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elem->out_sg = out_sg;
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elem->in_num = !!in_sg;
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elem->in_sg = in_sg;
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}
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void vu_init_elem(struct vu_virtq_element *elem, struct iovec *iov,
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int elem_cnt);
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int vu_collect(const struct vu_dev *vdev, struct vu_virtq *vq,
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struct vu_virtq_element *elem, int max_elem, size_t size,
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size_t *frame_size);
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void vu_set_vnethdr(const struct vu_dev *vdev,
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struct virtio_net_hdr_mrg_rxbuf *vnethdr,
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int num_buffers);
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void vu_flush(const struct vu_dev *vdev, struct vu_virtq *vq,
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struct vu_virtq_element *elem, int elem_cnt);
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void vu_kick_cb(struct vu_dev *vdev, union epoll_ref ref,
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const struct timespec *now);
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int vu_send_single(const struct ctx *c, const void *buf, size_t size);
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#endif /* VU_COMMON_H */
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